Application of in situ FTIR to deactivation by coke deposition

Advances on the application of in situ Fourier transform infrared (FTIR) spectrometry to coke deposition during catalytic processes of petrochemical industry, including catalytic isomerization, reduction, and cracking are reviewed in this paper. The mechanisms of coke deposition over solid acid catalysts and bi-functional noble metal acid catalysts are summarized. The causes of coke formation under different temperatures are also discussed. Based on the preliminary results of catalytic cracking of re-heptane over zeolites in our work, identification and assignment of IR absorption bands for coked substances as the key issues on application of in situ FTIR are put forward. Extended applications to the mechanisms of other catalytic reactions and the properties of catalysts are proposed.